Dynamo-electric machine



" (No Model.)

G. A. SCHBEFPER.

DYNAMO ELECTRIC MACHINE.

Wv'nessesx UNITED STATES PATENT OFFICE.

GUSTAVE A. SOHEEFFER, OF EVANSVILLE, INDIANA.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 267,263, dated November7, 1882.

Application filed August 26, 1882.

To all whom it may concern:

Be it known that I, G. A. SOHEEEFER, a citizen of the United States, anda resident of Evansville, in the county of Vanderburg and' State ofIndiana, have invented a new and valuable Improvement in Dynamo-ElectricMachines; and I do hereby declare that the following is a full, clear,and exact description of the construction and operation of the same,reference being had to the annexed drawings, making a part of thisspecification, and to the letters and figures of reference markedthereon.

Figure 1 of the drawings is a side view of my device. Fig. 2 is a sideview of the brass ring detached from the machine. Fig. 3 is an enlargedsectional view of the same, and Fig. 4 is a detail view.

This invention consists in an annular armature for electro-dynamicmachines, provided with a series of V-shaped soft-iron plates, arrangedupon a ring and connected together by an inner ring, these plates beingof two sizes and arranged in sets so that the sets of large and smallplates shall alternate with each other around the armature. The wires ofthe helix are wound around the sets of smaller plates, and air-spacesfor the free circulation of air are left between the sets of largerplates. Said plates are all connected, as hereinafter described.

Referring by letter to the drawings, A indicates an annular armature,provided with a peripheral series of V-shaped soft-iron pieces, 0, whichembrace the annulus, with the apices of their angles out ard. Thesepieces have each two opposite notches, 0, formed in their inner sides,and receiving a brass ring, D, arranged within the armature, the saidring being provided with a spider consisting of a central hub or collar,E, having a series of radial arms connecting it with the brass ring.This hub or collar is designed to be fitted upon the rotary shaft of themachine, and can be keyed or otherwise secured thereon. The V-shapedpieces vary in length, and are ar- (No model.)

ranged so that around the entire annulus there will be alternate sets oflong and short pieces, and the insulated wire of the helix wound aroundthe smaller piecesin the spaces between the larger ones, and connectedwith the commutator. When in motion a current of air passes through thespaces F between the sets of larger Vshaped pieces, and thereby servesto cool the parts. The armature thus formed and having thedouble-beveled edge involves more uniform magnetic action by theinduction of the field-magnets, the edges of the polar extensions beingmore strongly developed than their interior by the above peculiar shape,and thus distributing the action more uniformly on the armature. Thespaces F allow a free circulation of air, and at the same time space isafforded for the wire. When in motion, the current of air passes outthrough these openings, being propelled from the center by centrifugalforce, and, passing over a large area of surface, cools the same.

Having thus described my invention, whatl claim is- 1. An annulararmature consisting of a ring provided with a series of V-shaped platesof different lengths arranged in sets, so as to leave a peripheralseries of spaces for the circulation of air, substantially as described.

2. An armature provided with the differentsized V-shaped soft-ironplates connected by a brass ring, substantially as set forth.

3. The herein-described armature, provided with the V-shaped plates 0,of soft iron, made of different sizes and arranged in sets of alternatesizes, the wire being wound around the smaller plates, substantially asspecitied.

,In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

G USTAVE A. SOHE EFFER.

Witnesses ABRAHAIVL LOEWENTHAL, J r.,

ROBERT D. RICHARDSON.

